Sunan Ibn Majah 660
سنن ابن ماجه#660SahihIt was narrated from Zuhri that:Mahmud bin Rabi' remembered that the Prophet spat into a bucket from a well that belonged to them
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniSahih
Muhammad Fouad Abd al-BaqiSahih
Shuaib Al ArnautSahih
Zubair Ali ZaiSahih
In-book reference: 1:394